2. 4= 2², so neighboring perfect squares should look like 1² and 3²
1² 2² 3²
1 4 9
3. 16 = 4², so neighboring perfect squares are 3² and 5²
3² 4² 5²
9 16 25
4. 169 = 13²
12² 13² 14²
144 169 196
5. 9 = 3²
2² 3² 4²
4 9 16
6. 25 = 5²
4² 5² 6²
16 25 36
7. 49 = 7²
6² 7² 8²
36 49 64
